( Reaffirmed 2004 ) ISr846-196y - Indian Standard SPECIFICATION FOR SMITH'S FLATTERS f Chairman &RI K. N. P. RAO First Revision ) EDC 12 Re@xentin~ The Tata Iron and Steel Co Ltd, Jamshedpur Hand Tools Sectional Committee, Members SHRI K. R. VENKATACHALAM (Alternate to Shri K. N. P. Rao ) SHRI SIIR BANERJEE ' Metalcraft ( Ihdia ) Ltd, Calcutta SHRIH. N. GANGULY ( Alternate ) DIRECTOROF FLEETMAINTENANCE Indian Navy STAFF OFFICER ( D & P ) ( Alternate ) LT-COL J. C. JOSHI Department of Defence Production [Ministry of Defence ( DGI ) ] SHRI M. R. S. SOORMAi Al&mate ) SHR1S.K. I(EMPAL4H The Mysore Implements Factory, Hassan SHRI N. S. VENKATESHA ( Alternate ) SHRI G. KUPPUSWAMY Directorate General of Supplies & Disposals SHRI S. N. VOHRA ( Alternate) SHRI D. MAJUMDAR Development Commissioner, Small Scale Industries ( Ministry of Industrial Development and Company Affairs ) SHRI G. B. JAKHETIA ( Alternate ) SHRI S. D. MAJIJMDAR National Test House, Calcutta SHRI GOBINDOPKOSADPAUL Gobindo Sheet Metal Works & Foundry, Calcutta SHRI E. K. RAM~U~RLWNAN Kumar Industries, Parli ( S. Malabar ) ~Ministry of Food, Agriculture, Community Develop DR S. E. ROY mefit & Co-operation SHRI K. SANKARANARAYANAN Directorate General of Technical Develonment ( Ministry of Industrial Developmentand Company Affairs ) SHRI SATISH CHANDRA LT-COL G. B. SINGH Engineer-in-Chief's Branch, Army Headquarters Railway Board ( Ministry of Railways ) SHRI A. SITANATH SHRI R. P. SOOD Director of Industries, Government of Haryana SHRI M. SRINIVASAN Railway Board ( Ministry of Railways ) SHRI R. T. S. RANGIAH ( Altcmate ) Usha Forgings & Stampings Limited, New Delhi SHRI R. M. TALATI SHRI R. M. MOUDGILL( Altcrnatc ) Director General, ISI ( Ex-o$cio Member) SHRI M. V. PATANKAR, Director ( Mech Engg ) SL%-TC&V SHRI B. L. RAINA Assistant Director ( Mech Engg ), IS1 ( Continuedon ._ Pace 2 ) . (Al&mote) INDIAN MANAK STANDARDS BHAVAN, 9 BAHADUR NEW DELHI INSTITUTZON SHAH 1 ZAFAR tiARG IS:846-1968 ( Continuedfrom #age 1 ) Metal Workers' Tools Subcommittee, Members SHRI EDC 12 : 2 Refwes8nting S. C. BISWAS ' Mukand Iron & Steel Work.. Ltd, Bombay CHIEF MECHANICAL ENGINEER, Railway Board ( Ministry of Railways ) SOUTHERN RAILWAY Victor Tools Corporotion, Jullundur SHRI S. P. CHO~HAN The Presidency Edge Tools Co Ltd, Purulia (West SHRI J., P. SINGH DEO Bengal ) SHRI B. P. SINGH DEO ( Alternate) ~Directorate General of Supplies & Disposals SHRI A. K. GUHA SHRI S. K. KEMPAIAH The Mysore Implements Factory, Hassan SHRI N. S. VENKATESHA( Alternate ) SHRI hf. L. MEHROTRA Department of Defence Production [Ministry of SWRI P. C. P. NAMBOODWPAD Defence ( DGI ) ] South India Metal Co, Shoranur . 2 Indian Sttlndard SPECIFICATION FOR SMITH'S FLATTERS ( First Revision) 0. 0.1This Indian Standard FOREWORD ( First Revision ) was adopted by the Indian Standards Institution on 11 January 1968, after the draft finalized by the Hand Tools Sectional Committee had been approved by the Mechanical Engineering Division Gouncil. 0.2 This standard was originally issued in 1956. The present revision has been taken up to express the dimensions only in metric units rationalized to the extent practicable. 0.3 Flatters are being produced in India in many conventional sizes and shapes. The materials used also differ from manufacturer to manufacturer. This standard has, therefore, been prepared with a view to regulating the quality of indigenous products. 0.4 This standard specifies three types of flatters commonly used by metal workers. Type A is fitted with a wooden handle while Types B and C are used in conjunction with suitable tongs, clamps or other holding devices. It is recommended that purchasers should clearly state in their enquiry and order their specific requirements by reference to the types and sizes in this standard. 0.5 In the preparation of this standard, assistance has been derived from Specification No. IND/GS/443 ` Flatter head `, issued by the Ministry of Defence. 0.6 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with The number of significant places retained in the rounded off IS : 2-1960*. value should be the same as that of the specified value in this standard. l.SCOPE 1.1This standard covers the requirements for smith's flatters. *Ruler for~rounding off numerical values ( revised). 3 2. TYPES AND SIiES Sita 2.1 Smith's flatten shall be of the following types and sizes: ;rype A B C 3. MATERIAL 3.1 Flatter heads shall be manufactured from steel conforming to T60 of Schedule VI of IS : 1570-1961* with a maximum phosphorus and sulphur content of 0.05 percent each or from steel having the following chemical composition: Fig. 1 2 3 mm 50, 65 and 80 50 and 80 45 Constituent Carbon Manganese Phosphorus Sulphur Silicon 4. HARDNESS Percmt OS55to O-65 O-40 to O-75 0.05, M& O-05, Max 0.35, Max 4.1 Working faces of flatters shall have a hardness of 450 to 550 HV ( see IS : 1501-1959t ) or its equivalent in other scales. 4.2 For the determination tester may be used. 5. DIMENSIONS of hardness, any recognized form of hardness 5.1 The main dimensions of the flatters shall be as shown in Fig. 1 to 3. Flatters with slightly different dimensions may be accepted subject to prior agreement between the purchaser and the supplier. 6. DEVIATIONS ,$.i Permissible deviations on dimensions shall be as indicated in the relevant figures. Deviation on other dimensions shall be in accordance with thk best forging practice and shall not, in any case, exceed f 1 mm. *Schedules for wrought steels for general engineering purposes. tM&od for Vi&crs hardness test for steel. 4 1 I l-----+-i SECTION b-\ XX r 35 J.-l b--50,65 AND 80 SQd 4.~ r 25 22 + X X _ --J 30 \A f15 All dimensions in millimetres. FIG. 1 DIMENSIONS FOR FLATTERS,TYPE A a 5 ls:846-1968 I SECTION SECTION XX I XX cc50 AND 804 All dimensions in millimetres. All dimensions III millimetres. F!~. 2 DIMENSIONSFOR FLATTERS, TYPE l3 FIG. 3 DIMENSIONS FOR FLATTERS, TYPE C 7. HANDLES 7.1 When the handles are required to be supplied with flatters of Type A, to requirements of those of class 1 as specified in they shall conform They shall be shaped, before fitting, to suit the eyes of 1s : 620-1965". flatters, Type A. 8. MANUFACTURE. The eye in 8.1 Flatters shall be soundly forged to the shape in one piece. flatters of Type A shall be correctly shaped, central and oval, and shall be drifted from both sides to leave a central waist. *General requirements for wooden tool handles ( second reoision ). 6 Is:846-1968 8.2 The notches on flatters of Types B and C shall be well made, square with respect to the longitudinal axis and situated central to the length of the flatter. The working faces shall be properly and evenly hardened and tempered. 9. WORKMANSHIP AND FINISH 9.1 Flatters shall be free from flaws, seams, scales, pits, burrs, brittleness and other defects. The eye, in case of flatters of Type A, shall be free from sharp edges. 9.2 Flatters bright. shall be finished smooth with working faces flat and finished 10. DESIGNATION 10.1 Flatters shall be designated used name, size, and of this standard. by: a) commonly b) type, c) nominal d) number Example: A smith's flatter, designated as: Type A of nominal Flatter size 50 mm shall be Smith's A50 IS : 846 11. SUPPLY OF SMITH'S FLATTERS to supply of smith's flatters shall con- 11.1 General requirements form to IS : 13S7-1959*. 12. PRESERVATIVE 12.1 Flatters required relating TREATMENT with a suitable anti-corrosive paint, when shall be coated by the purchaser. 13. MARKiNG 13.1 Flatters shall be clearly and legibly stamped with the manufacturer's name or initials and/or recognized trade-mark, type, and size. When specifically required by the purchaser, the year of manufacture shall also be marked. _.__~____ *General supply conditions of metal and metal products. 7 Ist846-1968 13.1.1 Flatters may also be marked with the IS1 Certification Mark. NOTE - The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act, and the Rules and Regulations made thereunder. Presence of this mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard, under a well-defined system of inspection, testing and quality control during production. This system, which is devised and supervised by IS1 and operated by the producer, has the further safeguard that the products as actually marketed are continuously checked by IS1 for conformity to the standard. Details of conditions, under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from,.*the Indian Standards Institution. 14. PACKING 14.1 Flatters shall be securely packed in suitable packing -boxes of size convenient for handling in transit and as specified by the `purchaser. Each size of flatters shall be kept separate when packed, and a package shall contain flatters of only one type. 15. SAMPLING 15.1 Unless otherwise agreed to between the supplier and the~purchaser, the sampling plan as given in Appendix A shall be followed. 16. MECHANICAL 16.1 The 6 mm sign thick TEST working face on a mild steel plate full blows shall be struck on the tOD The flatter shall not show any a 3.5-kg sledge hammer. after the test. flatter shall be held with its Laced on an anvil. Five I of the flatter of damage with or distortion APPEND1 ( Clause SCALE OF SAMPLING X A 15.1 ) FOR CONFORMITY AND CRITERIA A-1. SCALE OF SAMPLING A-l.1 Lot - In any consignment all the smith's flatters of the same type and size manufactured under essentially similar conditions of manufacture shall constitute a lot. 8 IS : 846 - 1968 A-1.2 For ascertaining specification, tests shall of smith's flatters to accordance with co1 1 TABLE 1 the conformity of the lot to the requirements of this be carried out for each lot separately. The number be selected at random for this purpose shall be in and 2 of Table 1. SIZE AND SAMPLE CRITERIA FOR CONFORMITY ( Clauses A-1.2, A-1.3, A-2.1.1 and A-2.2 ) LOT SIZE' `* FOR HARDNESS, DIMENSIONS, WORKMANSHIP AND FINISH r-.-___~ -------~ Sample Permissible No. Size of Defectives FORMECHANICAL TEST, SUB-SAMPLE SIZE N Up 26 51 101 151 301 (1) to 25 ,, 50 ,, 100 ), 150 )) 300 and above ck 3 5 8 13 20 32 (3) 0 0 0 1 : (4) 2 2 3 4 : - A-1.3 The flatters shall be selected ness of selection, random number not available the followingprocedure at random and to ensure the randomIf the tables are tables shall be used. is recommended for use: Starting from any flatter in a lot, count them in one order as 1, 2, 3,. . . . . . . . . . . . . . ) up to r and so on where r is the integral part of N/n ( .N being the lot size and n the sample size indicated in co1 2 of Every rth smith's flatter thus counted shall be selected Table 1 ). to constitute the sample. A-2. NUMBER OF TESTS AND CRITERIA FOR CONFORMITY A-2.1 The smith's flatters selected according to A-l.3 shall be examined for hardness ( see 4 ) , dimensions ( see 5 ), and workmanship and finish ( see Any flatter failing to meet the requirements of any one or more of 9). the characteristics shall be considered defective. A-2.1.1 If the number of defective flatters in the sample is less than or equal to the corresponding permissible number of defectives given in co1 3 of Table 1, the lot shall be declared conforming to the characteristics mentioned in A-2.1. A-2.2 From the lots found satisfactory in accordance with A-2.1.1, a subsample of the size indicated in co1 4 of Table 1 shall be selected and subjected to mechanical test ( see 16 ). A-2.2.1 If aB the flatters subjected to mechanical requirements, the lot shall be declared conforming this standard; otherwise not. 9 test satisfy the necessary to the requirements of